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Thread: startup - high rpm flare

  1. #1
    Tuner in Training
    Join Date
    Feb 2009
    Posts
    28

    startup - high rpm flare

    I have a 2006 chevy trailblazer with the 4.2 I6. I have an eaton M112 supercharger and liquid to air intercooler setup. When I start the car, it starts fine, but flares up like crazy...probably 2500-3000 rpm. I'm guessing that since it is supercharged and there is a huge volume of air behind the throttle body(3" piping and liquid to air intercooler), it doesn't pull vacuum until it uses all this air and the bypass on the supercharger activates once it's pulling vacuum. How do I fix this?

    There is not too many tables to mess with in the I6 file. I'm thinking I'll increase the values in the cranking ve table since it probably takes a second for the blower bypass to actually bypass.

    Can anyone off some advice?

  2. #2
    Senior Tuner Iam Broke's Avatar
    Join Date
    Jul 2009
    Posts
    2,305
    On my LS3 there is a startup air table, I decreased it ~3% from stock and no more serious flaring. If you get it too low, it'll hunt & die. Not sure if you have the same table or not under the idle airflow tab.
    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel